Self-lubricating spring-bolt.



D. H. TWAITS.

SELF LUBRICATING SPRING BOL.

APPLICATION HLED 0m22.191s.

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DANIEL H. TWAITS, OF CHICAGO, ILLINOIS.

SELF-LUBRICATING SPRING-BOLT.

Application filed December 22, 1913.

To all whom t may concern:

Be it known that I, DANIEL H. TwArTs, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Self-Lubricating Spring-Bolts, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to lubricating spring,bolts of a type wherein there is a reservoir for the lubricant within the bolt, and its general 4object is to providel a very simple, durable spring bolt which may be cheaply manufacture A more specific object is to provide a plug for closing one endv of a tubular member, forming the shank of the bolt, which may be rigidly secured'therein, and which has integral therewith an enlarged angular portion 'forming .the head of the bolt.

To the above ends, the invention consists in a combination of parts hereinafter de-v scribed and ysummarized inthe claims.

In the drawings, Figure l is a plan of the bolt showing the same in position extending through the eye and shackles cfa suitable spring; Fig."2 is a longitudinal section of the bolt also showing the eye and shackles of the spring; Fig. 3 is an enlarged detail view of the head of the bolt; Fig. 4 is a cross section of the same taken on the lin'e 4-4 of Fig. 3; Fig. 5 is an end elevation 'of the opposite end of the bolt.

Referring to the parts by numerals: l0 is a tubular member forming the shank of the bolt, the interior bore 11 of which when closed at the ends, forms a reservoir for the,

lubricant. This bore 11 may be of the same diameter throughout the full length, which greatly facilitates the manufacturing of this member. At the head end, the tubular member is` squared ofi', vas a't 12, to lit the shoulder 14. of the angular head 15. This angular head has a reduced portion 17 integral therewith and having a cylindrical4 exterior .tightly fitting into the end -of the bore '11. f

.When forcedv into place, the shank 17 is rigidly secured to the member 10 by pins 18 extending'throughthis member and through the shank ,17, .and haviuggtheir Specification of Letters Patent.

upset notches in the- ,Sid of Patented Sept. 28', 1915.

serial No. 808,163.

and crossed, as shown in Fig. 4.' The upset ends are smoothed of to conform to the exterior surface of the member 10, which allows this member to `be passed through the shackle 20 and into the usual bushing 21 mounted in the eye 22 of one of the spring members.

The crossing of the pins 18 secures the shank 17 to the member 10 at points evenly distributed about the clrcumference of the bolt, and at the same time leaves room in this shank for a longitudinal passage 25 which communicates at its inner end with a transverse passage 26, and through which lubricantmay be supplied to the interior of the member 10. The upper portion of this passage 26 is preferably threaded as at 27,

and is normally closed by a suitable headless screw 28, which prevents leakage of the lubricant and at the same time does not allow grit and dirt to get into the interior of the As it will'be seenp have very tightly closed this end of the tubular member and at the same time have provided a simple and rigid head for the bolt. This head is securely held against being ulled4 out of the tubular member when the bolt is drawn tightly into place, and a wrench may be used on the angular portion of the head Without any danger of,turning the head Withnelation to the tubular portion. The head of the bolt may be of any desired shape, but it is preferably angular as shown, and for the sake of appearance, is provided with a dome portion 29, which may be formed on the head in the process of making.

The opposite end of the bolt may be closed by an internally threaded cap 30 engaging threads 31 on the exterior of the tubular member. The exterior of this cap is preferably angular and when screwed in place, a squared off portion 32 engages a Washer 33 to draw the bolt into place, the cap thereby acting as the nut for the bolt. The leakage of the lubricant is prevented at this end of the bolt, by a resilient packing 35 which is carried in an undercut seat 36 formed at the inner end of the threads of the cap. The washer 33- is preferably "la suitable lock washer and as showrnis provided'with projecting yportions 3'1 ,engaging Suitable thefsha' j e 38 and een@ the flattened sides et the eap 39 after being' screwed into place, thereby preventing it from inadrertently turning.

nv suitable means may be provided for li'eraling the lubricant from the interior of the bolt to the bearing surfaces. As shown, l have provided Wiel members el@ mounted in porous metallic tubes ll which extend through suitable openings in the sides of the tubular member. The lubricant travels by capillary action :in the ivielrs el() trom the interior or the bolt, to the bearing surface 1li-3. The belt isi'iiattened off at @A to provide a passage insuring the lubricant coming in contant ivi th the bearing surface Jfor the full. length thereof.

Any suitable means may be provided for hole ig the bolt with the wicks in the upright position and the passage 26 at the top side oit the bolt head. s shown, I have provided a pin ai? carried by the head,

and engaging a suitable depression in the shackle 2U,

It will be seen from the foregoing description that have provided a bolt which may be very cheaply manufactured.

The tubular member` l() may be merely a short length of hollow tubing or may be readily formed from a solid piene by boring,f out the interior, while the head portion may be very readily i''ormed from solid bar, by processes Well known in the art, and when formed, rigidly secured to the tubular member, by the pins, as described The eap portion at theotner end as well as the above mentioned parts, maiY be eonvenientty made `from materials easily obtainable.

- .l'laving thus described my invention, what l claim is: Y

l. ln a spring bolt, the combination of a tubular member 'forming the shank ot' the bolt, a head haring a vportion integral therewith and extendinginto the tubular member and closing ytln.,e,i`id ot the same, means extending through the wall of the tubular member and engaging' said portion ot the head within the Ttubular member, and lubricating passages leading into and from the interior o'f the bolt.`

2. ln a spring bolt, the combination olE a tubular member forming the shank oi thel bolt and having a evlindrieal bore, a. head having a o ylindrii-al male portion extending into the und ot-lhe tubular member' awl tightlyY fitting .tho safnaf,l a pin extondmg through the wall ol' the tubular member and into the male. portion ol" the head` a reiner-- able elosure lor the other `end or the bore, and lubrii-anl, outlet means for the bolt.

Il, -ln a spring bolt. the combination ol a tubular member l'erniing tlie sllanl\' olt the bolt` a head haring a male portion integral lherex. ilb, an eulargei. angular portion, said unile por! io: adapted to enter the end ol' the tubular portion, and a pin. extending said shoulder adapted to abut the squared olf end of the tubular port-ion, and 'a pin extending through the tubular portion and through the male portion, said tubular member haring an opening for admitting lubri nant and lubricant outlet means.

5. In a spring bolt, the Combination of a tubular member` an angular head having a male portion adapted to enter and close the end of the tubular member, and two pins passing through the end of the tubular member and through said male portion, said pins being, adjacent and at an angle with each otlnn'.l said tubular member having an opening for afh'nitting lubricantaind lubri-` cant outlet means. i

G. In a spring bolt, the combination of a tubular member, a plug fitting into om end thereof, ay pin extending through the ein] of i the tubular member and said plug, and a passage extending through said plug into the interior ot' the tubular member, said passage being so arranged as tov extend past said pin at one side thereof, said tubular member ha ving lubricant outlet means.

` 7. ln a spring bolt, the combination 4of a tubular member, a plug fitting into one end thereof, two pins extending through the end ort the tubular membra' and said plug and,` said pins being adjacent and at an angle with ear-.h other, and a longitudinal passage extending through said plug into the interior of theA tubular member, said passage being so positioned as to extend pastv said pins und between the sides of the angles t'ormed by the. pins, said tubular member having lubricant outlet means.

H. lln a spring bolt, the combinati-ni of i tubular member externally threaded at one `end and haring a boreextending throughvout the length thereof, a nap screwed onto said exterior threads ,and closing one end thereof, a head havingan enlarged angular portionxand a reduced male portion tightly fitting one end ol" .said bore` a pin'extend- *ing through said tubular member and through said male portion, and a. passage. in" said head leading to the/interior olf they tubui, lar member, said tubular member having lulnieant outlet means.

ll., ln a spring bolt, the eombination of .f1` tubular member open at eaeh end. a. head haring an angular portion and a redueed isn portion fitting the inside of said tubular member and closing one end thereof, a. pin extending through said tubular member and through Said`lmale portion, a longitudinal v passage in said male portion extending into said head, a radial passage in said head eommunieating with the longitudinal passage, and a plug threaded into said radial passage, said tubular member having lubricant outlet means.

10. In a spring bolt, the combination of a tubular member, a plug iitted into one end thereoI and having an angular head, means for securing the plug in the end-of the tubu lar member whereby it forms the bolt head, aA passage through the bolt head tothe in terior of the tubular member, lubricating outlet means for the tubular member, the

end of the tubular member opposite the head being threadeci, sind a threafle-' Cap closing that end of the tabular .member and form ing the mit e'" 'the bolt.

1l.v ln a spring bolt, the combination of a tubular member, au angular head having aportion'extending into one end 'of the tubular member, means for securing it thereto, a passage through the head reading to the in* terior of the tubular member, said tubular member having hihzieating outlet mea-ns,

' and a cap threakiea onto the other end of the tubular member dosing' the same and forming the. nut for the bolt.

ln testimoniT whereof, i hereunto affix my signature in the presence of two Witnesses. DNIEL H. Tl ITS. TWitnesses Hrziame'rra A. @DAL Calama lil. Gemine. 

